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United States Patent | 5,561,374 |
Russ | October 1, 1996 |
A vehicle speed measurement system (8) and method for driving a vehicle speed display responsive to a vehicle speed signal (300-334). A vehicle speed signal having a period corresponding to distance traveled by a vehicle is counted each first predetermined time period to provide a count (300-314); a preselected number of the counts are summed (316), the sum is filtered (318); the filtered sum is converted to the measurement of vehicle speed and a control signal for driving the vehicle speed display in response to the measurement is generated (320).
Inventors: | Russ; Ronald P. (Farmington Hills, MI) |
Assignee: | Ford Motor Company (Dearborn, MI) |
Appl. No.: | 334098 |
Filed: | November 3, 1994 |
Current U.S. Class: | 324/166; 324/144; 702/142 |
Intern'l Class: | G01P 003/42; G01P 001/04; G01P 003/00 |
Field of Search: | 324/160,161,163,166,167,143,144,146 364/565,572 377/24,24.1 |
3699563 | Oct., 1972 | Cass | 324/161. |
3748533 | Jul., 1973 | South | 324/166. |
4648104 | Mar., 1987 | Yachida et al. | 324/166. |
4779213 | Oct., 1988 | Luitje | 324/166. |
4924420 | May., 1990 | Hadley et al. | 324/160. |
4939675 | Jul., 1990 | Luitje | 324/166. |
4988944 | Jan., 1991 | Ito | 324/143. |
5097203 | Mar., 1992 | Haussmann et al. | 324/167. |
5225749 | Jul., 1993 | Watanabe | 324/163. |
5357196 | Oct., 1994 | Ito | 324/166. |